A076959 Number of primes between 3^n and 4^n.

0, 2, 9, 32, 119, 435, 1573, 5695, 20773, 76057, 279850, 1033937, 3837070, 14296494, 53468768, 200673056, 755606952, 2853697709, 10807617884, 41036410818, 156186010430, 595759180892, 2277112205791, 8720036044777, 33451314673521, 128533154571957

Offset

1,2

Links

Table of n, a(n) for n=1..26.

Formula

a(n) = A086680(n) - A055729(n).

Prog

(PARI) a(n) = primepi(4^n) - primepi(3^n); \\ Michel Marcus, Mar 22 2015

Crossrefs

Cf. A055729, A086680.

Sequence in context: A077644 A292482 A053369 * A003697 A006253 A045630

Adjacent sequences: A076956 A076957 A076958 * A076960 A076961 A076962

Keyword

nonn

Author

Amarnath Murthy, Oct 21 2002

Extensions

More terms from Ralf Stephan, Oct 31 2002

a(14)-a(26) added by David Baugh, Mar 22 2015

Status

approved